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<h1 class="topictitle1">恢复openGauss</h1>
<div><p>当需要对已备份的openGauss备份集进行恢复时，可以参考本节恢复openGauss备份集至原位置或新位置。</p>
<div class="section"><h4 class="sectiontitle">背景信息</h4><div class="p">支持使用备份副本、复制副本、归档副本、导入的副本进行恢复。支持恢复至原位置或新位置。<div class="note"><img src="public_sys-resources/note_3.0-zh-cn.png"><span class="notetitle"> </span><div class="notebody"><p>复制副本不支持恢复至原位置，复制副本的归档副本不支持恢复至原位置。</p>
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<div class="section"><h4 class="sectiontitle">注意事项</h4><ul><li>基于openGauss3.0数据库应用，在进行实例恢复时，恢复任务显示失败，且集群处于降级状态（主节点已经启动成功，备节点启动失败的状态为降级状态），请尝试手动重建备节点。</li><li>数据库系统用户登录备用节点，执行<strong>gs_ctl build</strong> <em>数据目录</em>命令重建备节点。</li></ul>
<div class="note"><img src="public_sys-resources/note_3.0-zh-cn.png"><span class="notetitle"> </span><div class="notebody"><p>数据目录为实例运行时指定的数据目录，若运行时未指定，默认为安装部署时数据库主节点配置的数据目录。</p>
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<div class="section"><h4 class="sectiontitle">前提条件</h4><ul><li>恢复前请确保恢复目标位置的数据目录剩余空间大于恢复副本缩减前大小，否则恢复将失败。</li></ul>
<ul><li>执行新位置恢复前，请确保数据库安装用户具有恢复目标路径的读写权限。</li><li>恢复前请确保目标数据库系统状态正常。<div class="note"><img src="public_sys-resources/note_3.0-zh-cn.png"><span class="notetitle"> </span><div class="notebody"><p>在数据库单机节点或集群任一节点使用运行数据库的操作系统账号，执行gs_om -t status，回显中cluster_state的值为Normal，说明数据库系统状态正常。</p>
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<div class="section"><h4 class="sectiontitle">操作步骤</h4><ol><li><span>选择<span class="uicontrol" id="opengauss-0044__zh-cn_topic_0000001839142377_uicontrol13535171992714">“<span id="opengauss-0044__zh-cn_topic_0000001839142377_text19535171918274">数据利用</span> &gt; <span id="opengauss-0044__zh-cn_topic_0000001839142377_text175351119172711">副本数据</span> &gt; <span id="opengauss-0044__zh-cn_topic_0000001839142377_text59261952124911">数据库</span> &gt; <span id="opengauss-0044__zh-cn_topic_0000001839142377_text11575567321">openGauss</span>”</span>。</span></li><li><span>您可以以openGauss数据库资源维度或以副本维度查找副本，本节以资源维度为例进行说明。</span><p><p>在<span class="uicontrol">“<span>资源</span>”</span>页签，根据资源名称查找到需要恢复的资源，并单击资源名称。</p>
</p></li><li><span>依次选择年、月、天找到副本。</span><p><p>当时间上显示<span><img src="zh-cn_image_0000001792390552.png"></span>，即表示该月、该天存在副本。</p>
</p></li><li><span>指定副本进行恢复。</span><p><ul><li>指定副本恢复<p>在副本数据页面单击<span><img src="zh-cn_image_0000002044857604.png"></span>，在需要恢复的副本所在行单击<span class="menucascade">“<span class="uicontrol"><span>更多</span></span> &gt; <span class="uicontrol"> <span>恢复</span></span>”</span>。</p>
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<div class="p">相关参数说明如<a href="#opengauss-0044__zh-cn_topic_0000001385658689_table194961441141219">表1</a>。
<div class="tablenoborder"><a name="opengauss-0044__zh-cn_topic_0000001385658689_table194961441141219"></a><a name="zh-cn_topic_0000001385658689_table194961441141219"></a><table cellpadding="4" cellspacing="0" summary="" id="opengauss-0044__zh-cn_topic_0000001385658689_table194961441141219" frame="border" border="1" rules="all"><caption><b>表1 </b>恢复openGauss备份集</caption><colgroup><col style="width:32.019999999999996%"><col style="width:67.97999999999999%"></colgroup><thead align="left"><tr><th align="left" class="cellrowborder" valign="top" width="32.019999999999996%" id="mcps1.3.5.2.4.2.2.2.2.3.1.1"><p>参数</p>
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<th align="left" class="cellrowborder" valign="top" width="67.97999999999999%" id="mcps1.3.5.2.4.2.2.2.2.3.1.2"><p>说明</p>
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<tbody><tr><td class="cellrowborder" valign="top" width="32.019999999999996%" headers="mcps1.3.5.2.4.2.2.2.2.3.1.1 "><p><span>恢复至</span></p>
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<td class="cellrowborder" valign="top" width="67.97999999999999%" headers="mcps1.3.5.2.4.2.2.2.2.3.1.2 "><p>选择恢复至<span class="uicontrol">“<span>原位置</span>”</span>或<span class="uicontrol">“<span>新位置</span>”</span>。</p>
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<tr><td class="cellrowborder" valign="top" width="32.019999999999996%" headers="mcps1.3.5.2.4.2.2.2.2.3.1.1 "><p><span>位置</span></p>
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<td class="cellrowborder" valign="top" width="67.97999999999999%" headers="mcps1.3.5.2.4.2.2.2.2.3.1.2 "><p>当选择恢复至<span class="uicontrol">“<span>原位置</span>”</span>时，默认显示恢复的位置。</p>
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<tr><td class="cellrowborder" valign="top" width="32.019999999999996%" headers="mcps1.3.5.2.4.2.2.2.2.3.1.1 "><p><span>目标集群</span></p>
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<td class="cellrowborder" valign="top" width="67.97999999999999%" headers="mcps1.3.5.2.4.2.2.2.2.3.1.2 "><p>当选择恢复至<span class="uicontrol">“<span>新位置</span>”</span>时，可选择恢复的目标集群。</p>
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<tr><td class="cellrowborder" valign="top" width="32.019999999999996%" headers="mcps1.3.5.2.4.2.2.2.2.3.1.1 "><p><span>目标实例</span></p>
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<td class="cellrowborder" valign="top" width="67.97999999999999%" headers="mcps1.3.5.2.4.2.2.2.2.3.1.2 "><p>当选择恢复至<span class="uicontrol">“<span>新位置</span>”</span>时，可选择恢复的目标实例。</p>
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<tr><td class="cellrowborder" valign="top" width="32.019999999999996%" headers="mcps1.3.5.2.4.2.2.2.2.3.1.1 "><p><span>数据库重命名</span></p>
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<td class="cellrowborder" valign="top" width="67.97999999999999%" headers="mcps1.3.5.2.4.2.2.2.2.3.1.2 "><p>仅数据库恢复时才显示该参数，开启后可对恢复完成后的数据库进行重命名。</p>
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